[PATCH v2 02/12] drm: bridge/dw_hdmi: add audio sample channel status setting

[Yakir Yang]

When transmitting IEC60985 linear PCM audio, we configure the
Aduio Sample Channel Status information of all the channel
status bits in the IEC60958 frame.

Signed-off-by: Yakir Yang <ykk at rock-chips.com>
---
Changes in v2:
- Add audio sample channel status setting

 drivers/gpu/drm/bridge/dw_hdmi.c | 41 ++++++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/bridge/dw_hdmi.h | 20 ++++++++++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c
index 423addc..2ded957 100644
--- a/drivers/gpu/drm/bridge/dw_hdmi.c
+++ b/drivers/gpu/drm/bridge/dw_hdmi.c
@@ -204,6 +204,47 @@ static void hdmi_regenerate_n_cts(struct dw_hdmi *hdmi, unsigned int n,
 	hdmi_writeb(hdmi, n & 0xff, HDMI_AUD_N1);
 }
 
+static void hdmi_set_schnl(struct dw_hdmi *hdmi)
+{
+	u8 aud_schnl_samplerate;
+
+	switch (hdmi->sample_rate) {
+	case 32000:
+		aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_32K;
+		break;
+	case 44100:
+		aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_44K1;
+		break;
+	case 48000:
+		aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_48K;
+		break;
+	case 88200:
+		aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_88K2;
+		break;
+	case 96000:
+		aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_96K;
+		break;
+	case 176400:
+		aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_176K4;
+		break;
+	case 192000:
+		aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_192K;
+		break;
+	case 768000:
+		aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_768K;
+		break;
+	default:
+		aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_44K1;
+		break;
+	}
+
+	/* set channel status register */
+	hdmi_modb(hdmi, aud_schnl_samplerate,
+		  HDMI_FC_AUDSCHNLS7_SMPRATE_MASK, HDMI_FC_AUDSCHNLS7);
+	hdmi_writeb(hdmi, ((~aud_schnl_samplerate) << 4) | 0x2,
+		    HDMI_FC_AUDSCHNLS8);
+}
+
 static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk,
 				   unsigned int ratio)
 {
diff --git a/drivers/gpu/drm/bridge/dw_hdmi.h b/drivers/gpu/drm/bridge/dw_hdmi.h
index bc53452..603e645 100644
--- a/drivers/gpu/drm/bridge/dw_hdmi.h
+++ b/drivers/gpu/drm/bridge/dw_hdmi.h
@@ -162,6 +162,17 @@
 #define HDMI_FC_SPDDEVICEINF                    0x1062
 #define HDMI_FC_AUDSCONF                        0x1063
 #define HDMI_FC_AUDSSTAT                        0x1064
+#define HDMI_FC_AUDSV                           0x1065
+#define HDMI_FC_AUDSU                           0x1066
+#define HDMI_FC_AUDSCHNLS0                      0x1067
+#define HDMI_FC_AUDSCHNLS1                      0x1068
+#define HDMI_FC_AUDSCHNLS2                      0x1069
+#define HDMI_FC_AUDSCHNLS3                      0x106a
+#define HDMI_FC_AUDSCHNLS4                      0x106b
+#define HDMI_FC_AUDSCHNLS5                      0x106c
+#define HDMI_FC_AUDSCHNLS6                      0x106d
+#define HDMI_FC_AUDSCHNLS7                      0x106e
+#define HDMI_FC_AUDSCHNLS8                      0x106f
 #define HDMI_FC_DATACH0FILL                     0x1070
 #define HDMI_FC_DATACH1FILL                     0x1071
 #define HDMI_FC_DATACH2FILL                     0x1072
@@ -731,6 +742,15 @@ enum {
 /* HDMI_FC_AUDSCHNLS7 field values */
 	HDMI_FC_AUDSCHNLS7_ACCURACY_OFFSET = 4,
 	HDMI_FC_AUDSCHNLS7_ACCURACY_MASK = 0x30,
+	HDMI_FC_AUDSCHNLS7_SMPRATE_MASK = 0x0f,
+	HDMI_FC_AUDSCHNLS7_SMPRATE_192K = 0xe,
+	HDMI_FC_AUDSCHNLS7_SMPRATE_176K4 = 0xc,
+	HDMI_FC_AUDSCHNLS7_SMPRATE_96K = 0xa,
+	HDMI_FC_AUDSCHNLS7_SMPRATE_768K = 0x9,
+	HDMI_FC_AUDSCHNLS7_SMPRATE_88K2 = 0x8,
+	HDMI_FC_AUDSCHNLS7_SMPRATE_32K = 0x3,
+	HDMI_FC_AUDSCHNLS7_SMPRATE_48K = 0x2,
+	HDMI_FC_AUDSCHNLS7_SMPRATE_44K1 = 0x0,
 
 /* HDMI_FC_AUDSCHNLS8 field values */
 	HDMI_FC_AUDSCHNLS8_ORIGSAMPFREQ_MASK = 0xf0,
-- 
2.1.2